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Old 08-26-2016
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Join Date: Aug 2016
Location: whittier Ca
Posts: 1
Loss Power up hill

I have a 2002 ford ranger edge 3.0. I raised my truck 2 inches and it has 31 tires on it. I have very little power going up hill, In a 2 to 4% grade. I tried the Superchip Flashpaq to try to program my truck but it was worse than stock. I tried several settings but no improvement. While on the freeway at speeds 45 to 70 my rpm are 2000 to 2500. Going Up hill at 50mph my rpms are 4000 to 4500 and reving loud.

I have run out of ideas, any of you guys have any ideas to help me out. I appreciate any help thank you
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Old 08-27-2016
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Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,281
31" tires lowers the rear axle gear ratio so you lose low end power, but get better MPG because of lower RPM at highway speeds.

3.0l Vulcan engine is a high RPM engine, torque range is 3,200-3,800rpm, so it needs to be above 3,000rpm to have any power.

Lack of power can be a few things, best place to start is by getting a vacuum gauge and test the engine, vacuum gauge is $20-$25.
Good read here on test here: Technical Articles: Engine testing with a Vacuum Gauge - at Greg's Engine & Machine

Low vacuum could mean low compression so that would be the next test

Go here to get your current rear axle ratio off your drivers door label: http://www.therangerstation.com/tech...le_codes.shtml
label will also have stock tire size, get that diameter, usually 28"

Then go here and plug in your numbers: http://www.therangerstation.com/tech...ioChange.shtml

31" tire
28" tire
3.73 ratio

means actual ratio now is 3.37
New ratio 4.13 in rear axle would change truck back to 3.73 performance that you were used to, 4.10 is the closest ratio for that change

Last edited by RonD; 08-27-2016 at 09:23 AM.
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